VAMP and the Cobra Effect

In colonial India, the British government offered a bounty for dead cobras to reduce the snake population. People responded by actually breeding cobras for profit. When the Indian government realized this, the bounty ended, and so the breeders released the now-worthless snakes — leaving the city with far more cobras than before.

This “Cobra Effect” is a classic example of how well-intentioned rules can trigger unexpected behaviors and worsen the original problem.

Visa’s Visa Acquirer Monitoring Program (VAMP) may be creating its own version of this dynamic in the payments ecosystem.

Historically, the model was straightforward: Acquirers underwrote merchants, issued the MID, and monitored performance. Risk flowed downstream — if a merchant’s chargebacks, fraud, or refunds got too high, the acquirer intervened or terminated the account.

VAMP changes the equation.

“For the first time, your payment processing stability depends not only on your own performance, but on the aggregate risk of merchants you’ve never met.”

Merchants now operate under an Excessive threshold of 150 basis points (1.5%) for combined fraud + disputes. Acquirers, however, face a much tighter portfolio-level constraint: Above Standard at 50 basis points (0.5%) and Excessive at 70 basis points (0.7%).

A merchant running cleanly at 100 bps — well within Visa’s limits — can still lose their MID simply because their acquirer’s overall portfolio breaches the stricter ceiling.

For the first time, your payment processing stability depends not only on your own performance, but on the aggregate risk of merchants you’ve never met and your acquirer’s broader portfolio health.

How this could play out — two highly likely scenarios:

Strategic Fragmentation: Merchants, wary of sudden termination, begin spreading their volume across multiple acquirers (4–6 or more). Each relationship stays small and “safe,” but fraud and dispute data becomes fragmented, monitoring gets harder, and operational complexity + costs rise sharply.

Erosion of Partnership: Long-term merchant-acquirer relationships turn transactional. Merchants constantly monitor their acquirer’s VAMP ratio and keep backup processors ready. Acquirers, in turn, treat every merchant primarily as a risk number rather than a partner. Collaboration on fraud prevention and innovation declines, weakening the entire chain.

This represents a fundamental shift in accountability. Merchants can no longer treat acquirers as interchangeable infrastructure. They must now evaluate them on portfolio quality and stability — asking:

• What is my acquirer’s current VAMP ratio?
• How concentrated is their portfolio in higher-risk segments?
• Do I have true redundancy if they’re forced to tighten or terminate accounts?

I’m not certain if Visa fully anticipated this reversal of risk oversight, or if it’s an emergent outcome of tighter network controls. Either way, the balance between merchants and acquirers is changing — and both sides will need to adapt quickly.